40640247 has 12 divisors (see below), whose sum is σ = 58769464. Its totient is φ = 27062640.

The previous prime is 40640239. The next prime is 40640311. The reversal of 40640247 is 74204604.

It is not a de Polignac number, because 40640247 - 2³ = 40640239 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40640247.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40640227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8097 + ... + 12117.

Almost surely, 2^40640247 is an apocalyptic number.

40640247 is a deficient number, since it is larger than the sum of its proper divisors (18129217).

40640247 is a wasteful number, since it uses less digits than its factorization.

40640247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5150 (or 5147 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 27.

The square root of 40640247 is about 6374.9703528722. The cubic root of 40640247 is about 343.8102179022.

The spelling of 40640247 in words is "forty million, six hundred forty thousand, two hundred forty-seven".